While not free for business use, it is reasonable priced, has MANY features (too many to list), is very reliable and is easy to use. whats more, its native C++ code (so no problems with false autoit virus detections), and has been digitally signed for better vista support.

UVNC SC - UVNC-Helper - More Than VNC!This is one great project, that has moved from being a simple GUI for quick connections to being a fully fledged support system (with a apt-get system that allows support applications to be downloaded and run easily and simply on the clients computer as well as other great features).

This is an open source application, and JohnMC is always keen to help, and improve the project whenever needed.

it s constantly growing very quickly (too quick for me to keep up), and is well worth a look for those supporting clients remotely as a business (provided you can put up with the false autoit virus detections).

Remote Access ControlThis project allows for pre-defined connections, has a "crude" but effective GUI that many love, and is fanatically supported by its owner.

While it is not open source, the project owner appears to be very keen to keep it free for commercial use, and if you like it, you can donate to the cause ...

Chunk VNCWith a very simple GUI this is a standout application that is dedicated to using a repeater solution. Don't be fooled by the Simple GUI though, because i packs as much punch as most of the others in the above list.

as other projects emerge, i will try to keep this post updated (if you find any, PM me), to allow for new or returning forum users to find the best solution for their needs, without having to search for hours through the forums.